Apparatus for die-casting valve stems



May 22, 1928.

- s. L. WILLIAMS APPARATUS FOR DIE CASTING VALVE sTEMs Filed Sept.50,1926

16' U W/ W lmv EN'roia- Patented May 22, 1928 NITED s'rnrss PAINTOFFICE.

STEPHEN L. WILLIAMS, OF MARTIN'S FERRY, OHIO, ASSIGNOR TO WHEELINGENGI-i NEERING & MANUFACTURING GOMPANY, A COMPOSEI) OE STEPHEN L. WIL-LIAMS, AND A. S'. HELLSTROM, OF WHEELING, WEST VIRGINIA. V

APPARATUS FOR DIE-CASTING VALVE STEMS.

Application filed September 30, 1926., Serial No. 138,627.

This invention relates broadly to die-casting apparatus, and it has forits object: to.

Fi ure 1 is a vertical section of thebed and head portions of a powerpress embodying my invention, the press head being shown in its elevatedposition;

Figure 2 is a similar section showing the head lowered to the limit ofits movement and showing a blank for a valve stem form ed in the pressby extrusion. of the metal of a slug; I

Figure 3 is an'enlarged' side elevation of the slug employed; I

Figure 4 is a similar view of the casting formed by extruding the metalof the slug by means of the invention; and I Figure 5 is a similar viewof. the valve stem in the manufacture of which the cast-- ing isutilized.

Referring to said drawings, 1 designates the bed plate and 2 thevert-ically recipro-' cable head of a power press which, generallyconsidered, may be of-any appropriate type. Mounted in the bed plate 1with its upper end flush with the top surface of said plate is a dieblock 3 provided with a vertical bore 4 extending partially, as twothirds of the way, therethrough; and extending throughout the remainderof the thickness of said die block is a bore 4* of reduced diameterlocated in axially alined relation to said bore 4, an annular shoulder 5being thus formed intermediate said bores, as shown.

Said bore 4? registers at its lower end with a vertical bore 6 whichextends downward through the bed plate 1 from the die seat, or bottom ofthe die-receiving socket 7. Extending upward through the bore 6 andhaving its upper end received within the bore 43 of the die 3 is a gaugepin 8 which forms a bottom closure for said bore 4 and which may beadjusted to suit the length of the lower cylindrical portion 9 of thecasting S which is to be produced. The means for adjusting the elevationof said gauge pin 8 may be of any appropriate character involving amember, as 10, movable through apassage 11 in the bed-support-v ingframe 12 of the press into, stationary supporting relation to said pin.

which knock-out pins may be directed for effecting removal of the dieblock 3.

Any appropriate means may be employed The bed plate 1 has the usualpassages 13 through for depositing a brass slug 14 in the bore 4,

as,,for example, a feeder plate or table, .15.

shiftable over the top face of the bed plate to. and from a positionwherein a pocketlti. thereof in which the slug is initially received ispresented in register withsaid bore at and whence such, slug drops intosaid.

bore, seating upon the shoulder 5 as indicated in dotted linesin Fig. 1.

It will here be noted that the bore 4 is made of a diameter which snuglyaccommodates the, cylindrical slug 14 and that. the diameter of thelatter is that required for the barrel portionl? of" the casting, suchbarrel" in a socket, 19 in which is mounted an end.

of a plunger 20, a set screw 21 being employed for rigidly securing saidplunger in place. Said plunger, which is adapted to sov be carried intoand out of the bore 4 of the die block 3with reciprocations of the presshead 2 for effecting extrusion of the metal of the slug 14, has adiameter corresponding substantially with that of said bore 4 and hasextending therethrough an axial bore 22 of the diameter required for there duced stem portion 23- of the casting to be produced. Said bore 22 isaxially alined with a similar bore 24 provided in the holder 18, andreceived in the alined bores 22 and 2 1 is a pin 25 having on its upperend a head 26 which is normally held seated upon a shoulder 27 formed atthe junction of said bore 24 with a larger bore 28 in which is located acompression spring 29. Said spring is interposed between the head 26 ofthe pin 25 and a backing member 30 of the press head, as shown in Fig.1, and functions to yieldinglypresentthe pin in a depressed positionwherein it will predeviding for slight elevation of said pin toaccommodate any excess of metal in the slug over that which is requiredin the production. of the casting.

In practice, when the press head is lowered upon the bed, the plunger 20enters the bore 4: in the die and, seating upon the slug 14 which isheated to the required temperature, exerts a. force which causes themetal of the slug to be extruded into the bore 4; of the die and intothe bore 22 ot the plunger, as shown in Fig. 2, thus producing a diecasting of the form shown in Fig. 4.

What is claimed is 1. In apparatus for die casting valve" stems, a powerpress having a bed plate and a 'reciprocable head, said'bed plate havingtherein a die seat and a vertical bore opening through the bottom ofsaid seat, a die mounted'on said seat and having therein axially alinedvertical bores of which the lower is of smaller diameter than the upper,a gauge pin directed through the bore of the bed plate with its upperend received within the lower portion of the lower bore of the die, aholder carried by the press head, and a plunger carried by said holderand adapted to be lowered into extruding relation to a metal slugdisposed within the upper bore of the die, the external diameter of saidplunger corresponding approximately With the diameter of the lastmentionedbore, said plunger having therein an axial bore into whichmetal of the slug may be extruded.

2. In apparatus for die casting valve stems, a power press having a bedplate and a reciprocable head, said bed plate having therein a die seatand a vertical bore opening through the bottom of said seat, a diemounted on said seat and having therein axially alined vertical bores ofwhich the lower is of smaller diameter than the upper, said boresforming an annular shoulder at the junction there oi, a holder carriedby the press head, and a plunger carried by said holder and adapted tobe lowered with the press head into extruding relation to a metal slugseated upon said shoulder, said plunger having its external diametercorresponding approximately with the diameter of the upper bore of thedie and being provided with an axial bore into which metal of the slugmay be extruded.

3. In apparatus for die casting valve stems, a power press having a bedplate and a reciprocable head, said bed plate having therein a die seatand a vertical bore opening through the bottom of said seat, a diemounted on said seat and having therein axially alined vertical bores ofwhich the lower is of smaller diameter than the upper, said boresforming an annular shoulder at the junction thereof, a holder carried bythe press head, and a plunger carried by said holder and adapted to belowered with the press head into extruding relation to a metal slugseated upon said shoulder, said plunger" having its external diametercorresponding approximately with the diai'neter of the upper bore of thedie and being provided with an axial bore into which metal of the slugmay be extruded, an elevatable pin di rected downward into the bore ofsaid plunger, and compression means yieldingly maintaining said pindepressed to the limit of its downward movement. I

In testimony whereof, I affix my signature.

STEPHEN L; WILLIAMS.

